test/clip-fill-rule.c

   1 /*
   2  * Copyright © 2004 Red Hat, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software
   5  * and its documentation for any purpose is hereby granted without
   6  * fee, provided that the above copyright notice appear in all copies
   7  * and that both that copyright notice and this permission notice
   8  * appear in supporting documentation, and that the name of
   9  * Red Hat, Inc. not be used in advertising or publicity pertaining to
  10  * distribution of the software without specific, written prior
  11  * permission. Red Hat, Inc. makes no representations about the
  12  * suitability of this software for any purpose.  It is provided "as
  13  * is" without express or implied warranty.
  14  *
  15  * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
  16  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17  * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
  18  * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  19  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  20  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
  21  * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22  *
  23  * Author: Carl D. Worth <cworth@cworth.org>
  24  */
  25
  26 #include "cairo-test.h"
  27
  28 #define STAR_SIZE 20
  29
  30 static void
  31 star_path (cairo_t *cr)
  32 {
  33     cairo_move_to (cr, 10, 0);
  34     cairo_rel_line_to (cr, 6, 20);
  35     cairo_rel_line_to (cr, -16, -12);
  36     cairo_rel_line_to (cr, 20, 0);
  37     cairo_rel_line_to (cr, -16, 12);
  38 }
  39
  40 /* Use clipping to draw the same path twice, once with each fill rule */
  41 static cairo_test_status_t
  42 draw (cairo_t *cr, int width, int height)
  43 {
  44     cairo_set_source_rgb (cr, 1, 0, 0);
  45
  46     cairo_translate (cr, 1, 1);
  47     cairo_save (cr);
  48     {
  49         star_path (cr);
  50         cairo_set_fill_rule (cr, CAIRO_FILL_RULE_WINDING);
  51         cairo_clip (cr);
  52         cairo_paint (cr);
  53     }
  54     cairo_restore (cr);
  55
  56     cairo_translate (cr, STAR_SIZE + 1, 0);
  57     cairo_save (cr);
  58     {
  59         star_path (cr);
  60         cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
  61         cairo_clip (cr);
  62         cairo_paint (cr);
  63     }
  64     cairo_restore (cr);
  65
  66     return CAIRO_TEST_SUCCESS;
  67 }
  68
  69 CAIRO_TEST (clip_fill_rule,
  70             "Tests interaction of clipping with cairo_set_fill_rule",
  71             "clip", /* keywords */
  72             NULL, /* requirements */
  73             STAR_SIZE * 2 + 2, STAR_SIZE + 2,
  74             NULL, draw)